diff options
Diffstat (limited to 'arch/arm/mach-aspeed/ast-mctp.c')
| -rw-r--r-- | arch/arm/mach-aspeed/ast-mctp.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/arm/mach-aspeed/ast-mctp.c b/arch/arm/mach-aspeed/ast-mctp.c new file mode 100644 index 0000000..1dd746b --- /dev/null +++ b/arch/arm/mach-aspeed/ast-mctp.c @@ -0,0 +1,153 @@ +/******************************************************************************** +* File Name : arch/arm/mach-aspeed/ast-mctp.c +* Author : Ryan Chen +* Description : AST MCTP Ctrl +* +* Copyright (C) 2012-2020 ASPEED Technology Inc. +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by the Free Software Foundation; +* either version 2 of the License, or (at your option) any later version. +* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; +* without even the implied warranty of MERCHANTABILITY or +* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +* History : +* 1. 2013/07/15 Ryan Chen Create +* +********************************************************************************/ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> + +#include <mach/platform.h> +#include <asm/io.h> + +#include <mach/hardware.h> +#include <plat/regs-mctp.h> +#include <plat/ast_mctp.h> + +//#define AST_MCTP_DEBUG 1 + +#ifdef AST_MCTP_DEBUG +#define MCTPDBUG(fmt, args...) printk("%s() " fmt, __FUNCTION__, ## args) +#else +#define MCTPDBUG(fmt, args...) +#endif + +static u32 ast_mctp_base = 0; +static u8 txTag = 0; +static inline u32 +ast_mctp_read(u32 reg) +{ + u32 val; + + val = readl(ast_mctp_base + reg); + + MCTPDBUG("reg = 0x%08x, val = 0x%08x\n", reg, val); + + return val; +} + +static inline void +ast_mctp_write(u32 val, u32 reg) +{ + MCTPDBUG("reg = 0x%08x, val = 0x%08x\n", reg, val); + + writel(val, ast_mctp_base + reg); +} + +//***********************************Information *********************************** + +extern void ast_pcie_cfg_read(u8 type, u32 bdf_offset, u32 *value) +{ + u32 timeout =0; + u32 desc3,desc2; + txTag %= 0xf; +// printf("type = %d, busfunc = %x \n",type, bdf); + if((ast_mctp_read(AST_MCTP_INT) & MCTP_RX_COMPLETE) != 0) + printk("EEEEEEEE \n"); + + ast_mctp_write(0x4000001 | (type << 24), AST_MCTP_TX_DESC3); + ast_mctp_write(0x200f | (txTag << 8), AST_MCTP_TX_DESC2); + ast_mctp_write(bdf_offset, AST_MCTP_TX_DESC1); + ast_mctp_write(0, AST_MCTP_TX_DESC0); +// ast_mctp_write(0, AST_MCTP_TX_DATA); + + //trigger + ast_mctp_write(7, AST_MCTP_CTRL); + //wait +// printf("trigger \n"); + while(!(ast_mctp_read(AST_MCTP_INT) & MCTP_RX_COMPLETE)) { + timeout++; + if(timeout > 10000) { + printk("time out \n"); + *value = 0xffffffff; + goto out; + } + }; + + //read + desc3 = ast_mctp_read(AST_MCTP_RX_DESC3); + desc2 = ast_mctp_read(AST_MCTP_RX_DESC2); + ast_mctp_read(AST_MCTP_RX_DESC1); + + if( ((desc3 >> 24) == 0x4A) && + ((desc3 & 0xfff) == 0x1) && + ((desc2 & 0xe000) == 0)) { + *value = ast_mctp_read(AST_MCTP_RX_DATA); + + } else { + *value = 0xffffffff; + + } + +out: + txTag++; + ast_mctp_write(0x15, AST_MCTP_CTRL); + ast_mctp_write(0x3, AST_MCTP_INT); + //wait + while(ast_mctp_read(AST_MCTP_INT) & MCTP_RX_COMPLETE); + +} + +extern void ast_pcie_cfg_write(u8 type, u32 bdf_offset, u32 data) +{ + txTag %= 0xf; + + ast_mctp_write(0x44000001 | (type << 24), AST_MCTP_TX_DESC3); + ast_mctp_write(0x200f | (txTag << 8), AST_MCTP_TX_DESC2); + ast_mctp_write(bdf_offset, AST_MCTP_TX_DESC1); + ast_mctp_write(0, AST_MCTP_TX_DESC0); + ast_mctp_write(data, AST_MCTP_TX_DATA); + + //trigger + ast_mctp_write(7, AST_MCTP_CTRL); +// printf("trigger \n"); + //wait + while(!(ast_mctp_read(AST_MCTP_INT) & MCTP_RX_COMPLETE)); + + //read + ast_mctp_read(AST_MCTP_RX_DESC3); + ast_mctp_read(AST_MCTP_RX_DESC2); + ast_mctp_read(AST_MCTP_RX_DESC1); + txTag++; + ast_mctp_write(0x15, AST_MCTP_CTRL); + ast_mctp_write(0x3, AST_MCTP_INT); + //wait + while(ast_mctp_read(AST_MCTP_INT) & MCTP_RX_COMPLETE); + +} + +static int __init ast_mctp_init(void) +{ + MCTPDBUG("\n"); + ast_mctp_base = (u32)ioremap(AST_MCTP_BASE , SZ_256); + return 0; +} + +subsys_initcall(ast_mctp_init); + |
